Modified Live Virus for the vaccination of healthy, nonpregnant cattle, 3 months of age or older, as an aid in the control of respiratory disease caused by infectious bovine rhinotracheitis (IBR) virus and bovine virus diarrhea (BVD) virus (Types 1 and 2). Duration of Immunity has been demonstrated to be at least 6 months for IBR and BVD (Types 1 and 2).